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There's too many people in the world.

We need to continue to decrease the growth rate of the global population; the planet can't support many more people.

There are too many accidents that can befall life on a single planet.

In the years to come, the combination of climate change and population growth could have a devastating effect on the planet and, needless to say, on humanity.

I always thought we had an environmental problem, but I hadn't realized how urgent it was. James Lovelock writes that by the end of this century there will be one billion people left.

We are not overpopulated in an absolute sense; we've got the technology for 10 billion, probably 15 billion people, to live on this planet and live good lives. What we haven't done is developed our technology.

We are already overcrowded. There's no more room, and we must shut the borders.

I am certain there is too much certainty in the world.

When I was born, the world's population was 3.5 billion. There are now 6.8 billion people on the planet. By 2050, that's expected to rise to 9.4 billion. What's more, the Earth's resources aren't growing; they're decreasing - and rapidly.